The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
This app receives sound from voice or sound device by microphone and tell user the average of frequency & relative power of tones.The results is not absolute reliable, but it can helpful for your checking the difference of various sounds.It maybe helpful for tuning the guitar or the piano something.It maybe helpful for checking the change of someone's voice.It is all free & no advertise. Just try it.